Sandstone
Clastic Sedimentary Rock (composed mostly of quartz, SiO2)
sedimentary
Category
Synthetic Polymer (Synthetic Material)
Browse synthetic polymer (synthetic material) specimens identified by the Rock Identifier community.
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Quartzite Pebble
Quartzite (SiO2)
metamorphic
Sandstone (Beach Pebble)
Clastic sedimentary rock (primarily Quartz and Feldspar)
sedimentary
Quartz Chip
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon dioxide (SiO2)
Mineral / Sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Gray Limestone Pebble
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (likely Quartzose)
Arenite (SiO2 principal mineral)
sedimentary
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz with Limonite/Goethite staining)
sedimentary
Brown Jasper / River Siltstone
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Moonstone
Orthoclase (Potassium Aluminum Silicate), Formula: (K,Na)AlSi3O8
mineral
River Pebble (Gravel)
Clastic sedimentary rock (likely Siltstone or Mudstone pebble; SiO2 with various impurities)
sedimentary
Sandstone (Ferruginous)
Arenite (SiO2 with Fe2O3 cement)
sedimentary
Coquina or Fossilized Shell Aggregate
Calcareous bioclastic sedimentary rock (CaCO3)
sedimentary
Silver (Morgan Dollar)
Native Silver (Ag) - 90% Silver, 10% Copper alloy
mineral
Amazonite
K(AlSi3O8), Microcline (potassium feldspar)
mineral
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Chert Nodule in Limestone
Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
River Stone (Greywacke)
Greywacke (immature sandstone)
sedimentary
Jasper
Silicon dioxide (Quartz variety), SiO2
sedimentary
Fulgurite
Fulgurite (Lechatelierite/Silica glass)
mineral
Fossil Shell
Brachiopod or Mollusk fossil
fossil
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Fossil Shark Tooth
Otodus sp. or Carcharocles sp. (likely fossilized Chondrichthyes)
fossil
Chert (or Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Limonite (Ironstone)
Limonite (mixture of hydrated iron oxides, primarily Goethite α-FeO(OH))
mineral
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Chalcedony/Common Opal)
Microcrystalline Quartz (SiO2)
sedimentary
Limonite (Iron Ore)
Limonite (Hydrous iron(III) oxide-hydroxide mixture, primarily FeO(OH)·nH2O)
mineral
Jasper Agate
Silicon dioxide (SiO2)
mineral
Jasper (Nephrite-like appearance)
Silicon Dioxide (SiO2) with impurities
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
Mineral
Pyrite (Fool's Gold) Cube
Iron Sulfide (FeS2)
mineral
Asphalt (Bituminous Concrete)
Composite material (bitumen binder with mineral aggregate)
man-made rock (technosol)
Milky quartz
Quartz, silicon dioxide (SiO₂)
mineral
Wood Paneling
Engineered Wood / Plywood Paneling
not a rock
Chert (often called Jasper or Flint in this color variety)
Silicon Dioxide (SiO2)
sedimentary
Iron Slag
Iron Slag (Industrial Vitreous Material)
Mineral/By-product
Diamond (as set in a metal alloy ring)
Diamond (Pure Carbon, C)
mineral
Sandstone
Quartz Arenite / Sedimentary Rock
sedimentary